// Copyright 2017 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.android;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Predicates.not;
import static com.google.common.collect.ImmutableSetMultimap.toImmutableSetMultimap;
import static java.util.stream.Collectors.toList;
import static java.util.stream.Collectors.toMap;

import android.aapt.pb.internal.ResourcesInternal.CompiledFile;
import com.android.SdkConstants;
import com.android.aapt.ConfigurationOuterClass.Configuration;
import com.android.aapt.ConfigurationOuterClass.Configuration.KeysHidden;
import com.android.aapt.ConfigurationOuterClass.Configuration.NavHidden;
import com.android.aapt.ConfigurationOuterClass.Configuration.Orientation;
import com.android.aapt.ConfigurationOuterClass.Configuration.ScreenLayoutLong;
import com.android.aapt.ConfigurationOuterClass.Configuration.ScreenLayoutSize;
import com.android.aapt.ConfigurationOuterClass.Configuration.Touchscreen;
import com.android.aapt.ConfigurationOuterClass.Configuration.UiModeNight;
import com.android.aapt.ConfigurationOuterClass.Configuration.UiModeType;
import com.android.aapt.Resources;
import com.android.aapt.Resources.ConfigValue;
import com.android.aapt.Resources.Package;
import com.android.aapt.Resources.ResourceTable;
import com.android.aapt.Resources.Value;
import com.android.aapt.Resources.Visibility.Level;
import com.android.ide.common.resources.configuration.CountryCodeQualifier;
import com.android.ide.common.resources.configuration.DensityQualifier;
import com.android.ide.common.resources.configuration.FolderConfiguration;
import com.android.ide.common.resources.configuration.KeyboardStateQualifier;
import com.android.ide.common.resources.configuration.LayoutDirectionQualifier;
import com.android.ide.common.resources.configuration.LocaleQualifier;
import com.android.ide.common.resources.configuration.NavigationMethodQualifier;
import com.android.ide.common.resources.configuration.NavigationStateQualifier;
import com.android.ide.common.resources.configuration.NetworkCodeQualifier;
import com.android.ide.common.resources.configuration.NightModeQualifier;
import com.android.ide.common.resources.configuration.ResourceQualifier;
import com.android.ide.common.resources.configuration.ScreenDimensionQualifier;
import com.android.ide.common.resources.configuration.ScreenHeightQualifier;
import com.android.ide.common.resources.configuration.ScreenOrientationQualifier;
import com.android.ide.common.resources.configuration.ScreenRatioQualifier;
import com.android.ide.common.resources.configuration.ScreenRoundQualifier;
import com.android.ide.common.resources.configuration.ScreenSizeQualifier;
import com.android.ide.common.resources.configuration.ScreenWidthQualifier;
import com.android.ide.common.resources.configuration.SmallestScreenWidthQualifier;
import com.android.ide.common.resources.configuration.TextInputMethodQualifier;
import com.android.ide.common.resources.configuration.TouchScreenQualifier;
import com.android.ide.common.resources.configuration.UiModeQualifier;
import com.android.ide.common.resources.configuration.VersionQualifier;
import com.android.resources.Density;
import com.android.resources.Keyboard;
import com.android.resources.KeyboardState;
import com.android.resources.LayoutDirection;
import com.android.resources.Navigation;
import com.android.resources.NavigationState;
import com.android.resources.NightMode;
import com.android.resources.ResourceType;
import com.android.resources.ScreenOrientation;
import com.android.resources.ScreenRatio;
import com.android.resources.ScreenRound;
import com.android.resources.ScreenSize;
import com.android.resources.TouchScreen;
import com.android.resources.UiMode;
import com.google.common.base.Preconditions;
import com.google.common.base.Stopwatch;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.io.LittleEndianDataInputStream;
import com.google.devtools.build.android.FullyQualifiedName.Factory;
import com.google.devtools.build.android.aapt2.CompiledResources;
import com.google.devtools.build.android.proto.SerializeFormat;
import com.google.devtools.build.android.proto.SerializeFormat.Header;
import com.google.devtools.build.android.xml.ResourcesAttribute.AttributeType;
import com.google.protobuf.InvalidProtocolBufferException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.AbstractMap.SimpleImmutableEntry;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import java.util.function.BiConsumer;
import java.util.logging.Logger;
import java.util.stream.Stream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import javax.annotation.concurrent.NotThreadSafe;

/** Deserializes {@link DataKey}, {@link DataValue} entries from compiled resource files. */
public class AndroidCompiledDataDeserializer implements AndroidDataDeserializer {
  private static final Logger logger =
      Logger.getLogger(AndroidCompiledDataDeserializer.class.getName());

  static final ImmutableMap<Configuration.LayoutDirection, LayoutDirection> LAYOUT_DIRECTION_MAP =
      ImmutableMap.of(
          Configuration.LayoutDirection.LAYOUT_DIRECTION_LTR,
          LayoutDirection.LTR,
          Configuration.LayoutDirection.LAYOUT_DIRECTION_RTL,
          LayoutDirection.RTL);

  static final ImmutableMap<Configuration.ScreenLayoutSize, ScreenSize> LAYOUT_SIZE_MAP =
      ImmutableMap.of(
          ScreenLayoutSize.SCREEN_LAYOUT_SIZE_SMALL,
          ScreenSize.SMALL,
          ScreenLayoutSize.SCREEN_LAYOUT_SIZE_NORMAL,
          ScreenSize.NORMAL,
          ScreenLayoutSize.SCREEN_LAYOUT_SIZE_LARGE,
          ScreenSize.LARGE,
          ScreenLayoutSize.SCREEN_LAYOUT_SIZE_XLARGE,
          ScreenSize.XLARGE);

  static final ImmutableMap<Configuration.ScreenLayoutLong, ScreenRatio> SCREEN_LONG_MAP =
      ImmutableMap.of(
          ScreenLayoutLong.SCREEN_LAYOUT_LONG_LONG,
          ScreenRatio.LONG,
          ScreenLayoutLong.SCREEN_LAYOUT_LONG_NOTLONG,
          ScreenRatio.NOTLONG);

  static final ImmutableMap<Configuration.ScreenRound, ScreenRound> SCREEN_ROUND_MAP =
      ImmutableMap.of(
          Configuration.ScreenRound.SCREEN_ROUND_ROUND, ScreenRound.ROUND,
          Configuration.ScreenRound.SCREEN_ROUND_NOTROUND, ScreenRound.NOTROUND);

  private static final ImmutableMap<Configuration.Orientation, ScreenOrientation>
      SCREEN_ORIENTATION_MAP =
          ImmutableMap.of(
              Orientation.ORIENTATION_LAND, ScreenOrientation.LANDSCAPE,
              Orientation.ORIENTATION_PORT, ScreenOrientation.PORTRAIT,
              Orientation.ORIENTATION_SQUARE, ScreenOrientation.SQUARE);

  private static final ImmutableMap<UiModeType, UiMode> SCREEN_UI_MODE =
      ImmutableMap.<UiModeType, UiMode>builder()
          .put(UiModeType.UI_MODE_TYPE_APPLIANCE, UiMode.APPLIANCE)
          .put(UiModeType.UI_MODE_TYPE_CAR, UiMode.CAR)
          .put(UiModeType.UI_MODE_TYPE_DESK, UiMode.DESK)
          .put(UiModeType.UI_MODE_TYPE_NORMAL, UiMode.NORMAL)
          .put(UiModeType.UI_MODE_TYPE_TELEVISION, UiMode.TELEVISION)
          .put(UiModeType.UI_MODE_TYPE_VRHEADSET, UiMode.NORMAL)
          .put(UiModeType.UI_MODE_TYPE_WATCH, UiMode.WATCH)
          .build();

  static final ImmutableMap<Configuration.UiModeNight, NightMode> NIGHT_MODE_MAP =
      ImmutableMap.of(
          UiModeNight.UI_MODE_NIGHT_NIGHT, NightMode.NIGHT,
          UiModeNight.UI_MODE_NIGHT_NOTNIGHT, NightMode.NOTNIGHT);

  static final ImmutableMap<Configuration.KeysHidden, KeyboardState> KEYBOARD_STATE_MAP =
      ImmutableMap.of(
          KeysHidden.KEYS_HIDDEN_KEYSEXPOSED,
          KeyboardState.EXPOSED,
          KeysHidden.KEYS_HIDDEN_KEYSSOFT,
          KeyboardState.SOFT,
          KeysHidden.KEYS_HIDDEN_KEYSHIDDEN,
          KeyboardState.HIDDEN);

  static final ImmutableMap<Configuration.Touchscreen, TouchScreen> TOUCH_TYPE_MAP =
      ImmutableMap.of(
          Touchscreen.TOUCHSCREEN_FINGER,
          TouchScreen.FINGER,
          Touchscreen.TOUCHSCREEN_NOTOUCH,
          TouchScreen.NOTOUCH,
          Touchscreen.TOUCHSCREEN_STYLUS,
          TouchScreen.STYLUS);

  static final ImmutableMap<Configuration.Keyboard, Keyboard> KEYBOARD_MAP =
      ImmutableMap.of(
          Configuration.Keyboard.KEYBOARD_NOKEYS,
          Keyboard.NOKEY,
          Configuration.Keyboard.KEYBOARD_QWERTY,
          Keyboard.QWERTY,
          Configuration.Keyboard.KEYBOARD_TWELVEKEY,
          Keyboard.TWELVEKEY);

  static final ImmutableMap<Configuration.NavHidden, NavigationState> NAV_STATE_MAP =
      ImmutableMap.of(
          NavHidden.NAV_HIDDEN_NAVHIDDEN,
          NavigationState.HIDDEN,
          NavHidden.NAV_HIDDEN_NAVEXPOSED,
          NavigationState.EXPOSED);

  static final ImmutableMap<Configuration.Navigation, Navigation> NAVIGATION_MAP =
      ImmutableMap.of(
          Configuration.Navigation.NAVIGATION_DPAD,
          Navigation.DPAD,
          Configuration.Navigation.NAVIGATION_NONAV,
          Navigation.NONAV,
          Configuration.Navigation.NAVIGATION_TRACKBALL,
          Navigation.TRACKBALL,
          Configuration.Navigation.NAVIGATION_WHEEL,
          Navigation.WHEEL);

  static final ImmutableMap<Integer, Density> DENSITY_MAP =
      ImmutableMap.<Integer, Density>builder()
          .put(0xfffe, Density.ANYDPI)
          .put(0xffff, Density.NODPI)
          .put(120, Density.LOW)
          .put(160, Density.MEDIUM)
          .put(213, Density.TV)
          .put(240, Density.HIGH)
          .put(320, Density.XHIGH)
          .put(480, Density.XXHIGH)
          .put(640, Density.XXXHIGH)
          .build();

  private final ImmutableSet<String> filteredResources;

  /**
   * @param filteredResources resources that were filtered out of this target and should be ignored
   *     if they are referenced in symbols files.
   */
  public static AndroidCompiledDataDeserializer withFilteredResources(
      Collection<String> filteredResources) {
    return new AndroidCompiledDataDeserializer(ImmutableSet.copyOf(filteredResources));
  }

  public static AndroidCompiledDataDeserializer create() {
    return new AndroidCompiledDataDeserializer(ImmutableSet.of());
  }

  private AndroidCompiledDataDeserializer(ImmutableSet<String> filteredResources) {
    this.filteredResources = filteredResources;
  }

  private void readResourceTable(
      LittleEndianDataInputStream resourceTableStream, KeyValueConsumers consumers)
      throws IOException {
    long alignedSize = resourceTableStream.readLong();
    Preconditions.checkArgument(alignedSize <= Integer.MAX_VALUE);

    byte[] tableBytes = new byte[(int) alignedSize];
    resourceTableStream.read(tableBytes, 0, (int) alignedSize);
    ResourceTable resourceTable = ResourceTable.parseFrom(tableBytes);

    readPackages(consumers, resourceTable);
  }

  private void readPackages(KeyValueConsumers consumers, ResourceTable resourceTable)
      throws UnsupportedEncodingException, InvalidProtocolBufferException {
    List<String> sourcePool =
        decodeSourcePool(resourceTable.getSourcePool().getData().toByteArray());
    ReferenceResolver resolver = ReferenceResolver.asRoot();

    for (int i = resourceTable.getPackageCount() - 1; i >= 0; i--) {
      Package resourceTablePackage = resourceTable.getPackage(i);

      ReferenceResolver packageResolver =
          resolver.resolveFor(resourceTablePackage.getPackageName());
      String packageName = resourceTablePackage.getPackageName();

      for (Resources.Type resourceFormatType : resourceTablePackage.getTypeList()) {
        ResourceType resourceType = ResourceType.getEnum(resourceFormatType.getName());

        for (Resources.Entry resource : resourceFormatType.getEntryList()) {
          if (resource.getConfigValueList().isEmpty()
              && resource.getVisibility().getLevel() == Level.PUBLIC) {

            // This is a public resource definition.
            int sourceIndex = resource.getVisibility().getSource().getPathIdx();

            String source = sourcePool.get(sourceIndex);
            DataSource dataSource = DataSource.of(Paths.get(source));

            DataResourceXml dataResourceXml =
                DataResourceXml.fromPublic(dataSource, resourceType, resource.getEntryId().getId());
            final FullyQualifiedName fqn =
                createAndRecordFqn(
                    packageResolver, packageName, resourceType, resource, ImmutableList.of());
            consumers.combiningConsumer.accept(fqn, dataResourceXml);
          } else if (!"android".equals(packageName)) {
            // This means this resource is not in the android sdk, add it to the set.
            for (ConfigValue configValue : resource.getConfigValueList()) {
              FullyQualifiedName fqn =
                  createAndRecordFqn(
                      packageResolver,
                      packageName,
                      resourceType,
                      resource,
                      convertToQualifiers(configValue));

              int sourceIndex = configValue.getValue().getSource().getPathIdx();

              String source = sourcePool.get(sourceIndex);
              DataSource dataSource = DataSource.of(Paths.get(source));

              Value resourceValue = configValue.getValue();

              DataResource dataResource =
                  resourceValue.getItem().hasFile()
                      ? DataValueFile.of(dataSource)
                      : DataResourceXml.from(
                          resourceValue, dataSource, resourceType, packageResolver);

              if (!fqn.isOverwritable()) {
                consumers.combiningConsumer.accept(fqn, dataResource);
              } else {
                consumers.overwritingConsumer.accept(fqn, dataResource);
              }
            }
          } else {
            // In the sdk, just add the fqn for styleables
            createAndRecordFqn(
                    packageResolver, packageName, resourceType, resource, ImmutableList.of())
                .toPrettyString();
          }
        }
      }
    }
  }

  /** Maintains state for all references in each package of a resource table. */
  @NotThreadSafe
  public static class ReferenceResolver {

    enum InlineStatus {
      INLINEABLE,
      INLINED,
    }

    private final Optional<String> packageName;
    private final Map<FullyQualifiedName, InlineStatus> qualifiedReferenceInlineStatus;

    private ReferenceResolver(
        Optional<String> packageName,
        Map<FullyQualifiedName, InlineStatus> qualifiedReferenceInlineStatus) {
      this.packageName = packageName;
      this.qualifiedReferenceInlineStatus = qualifiedReferenceInlineStatus;
    }

    static ReferenceResolver asRoot() {
      return new ReferenceResolver(Optional.empty(), new HashMap<>());
    }

    public ReferenceResolver resolveFor(String packageName) {
      return new ReferenceResolver(
          Optional.of(packageName).filter(not(String::isEmpty)), qualifiedReferenceInlineStatus);
    }

    public FullyQualifiedName parse(String reference) {
      return FullyQualifiedName.fromReference(reference, packageName);
    }

    public FullyQualifiedName register(FullyQualifiedName fullyQualifiedName) {
      // The default is that the name can be inlined.
      qualifiedReferenceInlineStatus.put(fullyQualifiedName, InlineStatus.INLINEABLE);
      return fullyQualifiedName;
    }

    /** Indicates if a reference can be inlined in a styleable. */
    public boolean shouldInline(FullyQualifiedName reference) {
      return checkNotNull(
                  qualifiedReferenceInlineStatus.get(reference),
                  "%s reference is unsatisfied. Available names: %s",
                  reference,
                  qualifiedReferenceInlineStatus.keySet())
              .equals(InlineStatus.INLINEABLE)
          // Only inline if it's in the current package.
          && reference.isInPackage(packageName.orElse(FullyQualifiedName.DEFAULT_PACKAGE));
    }

    /** Update the reference's inline state. */
    public FullyQualifiedName markInlined(FullyQualifiedName reference) {
      qualifiedReferenceInlineStatus.put(reference, InlineStatus.INLINED);
      return reference;
    }
  }

  private FullyQualifiedName createAndRecordFqn(
      ReferenceResolver packageResolver,
      String packageName,
      ResourceType resourceType,
      Resources.Entry resource,
      List<String> qualifiers) {
    final FullyQualifiedName fqn =
        FullyQualifiedName.of(
            packageName.isEmpty() ? FullyQualifiedName.DEFAULT_PACKAGE : packageName,
            qualifiers,
            resourceType,
            resource.getName());
    packageResolver.register(fqn);
    return fqn;
  }

  private List<String> convertToQualifiers(ConfigValue configValue) {
    FolderConfiguration configuration = new FolderConfiguration();
    final Configuration protoConfig = configValue.getConfig();
    if (protoConfig.getMcc() > 0) {
      configuration.setCountryCodeQualifier(new CountryCodeQualifier(protoConfig.getMcc()));
    }
    // special code for 0, as MNC can be zero
    // https://android.googlesource.com/platform/frameworks/native/+/master/include/android/configuration.h#473
    if (protoConfig.getMnc() != 0) {
      configuration.setNetworkCodeQualifier(
          NetworkCodeQualifier.getQualifier(
              String.format(
                  Locale.US,
                  "mnc%1$03d",
                  protoConfig.getMnc() == 0xffff ? 0 : protoConfig.getMnc())));
    }

    if (!protoConfig.getLocale().isEmpty()) {
      // The proto stores it in a BCP-47 format, but the parser requires a b+ and all the - as +.
      // It's a nice a little impedance mismatch.
      new LocaleQualifier()
          .checkAndSet("b+" + protoConfig.getLocale().replace("-", "+"), configuration);
    }

    if (LAYOUT_DIRECTION_MAP.containsKey(protoConfig.getLayoutDirection())) {
      configuration.setLayoutDirectionQualifier(
          new LayoutDirectionQualifier(LAYOUT_DIRECTION_MAP.get(protoConfig.getLayoutDirection())));
    }

    if (protoConfig.getSmallestScreenWidthDp() > 0) {
      configuration.setSmallestScreenWidthQualifier(
          new SmallestScreenWidthQualifier(protoConfig.getSmallestScreenWidthDp()));
    }

    // screen dimension is defined if one number is greater than 0
    if (Math.max(protoConfig.getScreenHeight(), protoConfig.getScreenWidth()) > 0) {
      configuration.setScreenDimensionQualifier(
          new ScreenDimensionQualifier(
              Math.max(
                  protoConfig.getScreenHeight(),
                  protoConfig.getScreenWidth()), // biggest is always first
              Math.min(protoConfig.getScreenHeight(), protoConfig.getScreenWidth())));
    }

    if (protoConfig.getScreenWidthDp() > 0) {
      configuration.setScreenWidthQualifier(
          new ScreenWidthQualifier(protoConfig.getScreenWidthDp()));
    }

    if (protoConfig.getScreenHeightDp() > 0) {
      configuration.setScreenHeightQualifier(
          new ScreenHeightQualifier(protoConfig.getScreenHeightDp()));
    }

    if (LAYOUT_SIZE_MAP.containsKey(protoConfig.getScreenLayoutSize())) {
      configuration.setScreenSizeQualifier(
          new ScreenSizeQualifier(LAYOUT_SIZE_MAP.get(protoConfig.getScreenLayoutSize())));
    }

    if (SCREEN_LONG_MAP.containsKey(protoConfig.getScreenLayoutLong())) {
      configuration.setScreenRatioQualifier(
          new ScreenRatioQualifier(SCREEN_LONG_MAP.get(protoConfig.getScreenLayoutLong())));
    }

    if (SCREEN_ROUND_MAP.containsKey(protoConfig.getScreenRound())) {
      configuration.setScreenRoundQualifier(
          new ScreenRoundQualifier(SCREEN_ROUND_MAP.get(protoConfig.getScreenRound())));
    }

    if (SCREEN_ORIENTATION_MAP.containsKey(protoConfig.getOrientation())) {
      configuration.setScreenOrientationQualifier(
          new ScreenOrientationQualifier(SCREEN_ORIENTATION_MAP.get(protoConfig.getOrientation())));
    }

    if (SCREEN_UI_MODE.containsKey(protoConfig.getUiModeType())) {
      configuration.setUiModeQualifier(
          new UiModeQualifier(SCREEN_UI_MODE.get(protoConfig.getUiModeType())));
    }

    if (NIGHT_MODE_MAP.containsKey(protoConfig.getUiModeNight())) {
      configuration.setNightModeQualifier(
          new NightModeQualifier(NIGHT_MODE_MAP.get(protoConfig.getUiModeNight())));
    }

    if (DENSITY_MAP.containsKey(protoConfig.getDensity())) {
      configuration.setDensityQualifier(
          new DensityQualifier(DENSITY_MAP.get(protoConfig.getDensity())));
    }

    if (TOUCH_TYPE_MAP.containsKey(protoConfig.getTouchscreen())) {
      configuration.setTouchTypeQualifier(
          new TouchScreenQualifier(TOUCH_TYPE_MAP.get(protoConfig.getTouchscreen())));
    }

    if (KEYBOARD_STATE_MAP.containsKey(protoConfig.getKeysHidden())) {
      configuration.setKeyboardStateQualifier(
          new KeyboardStateQualifier(KEYBOARD_STATE_MAP.get(protoConfig.getKeysHidden())));
    }

    if (KEYBOARD_MAP.containsKey(protoConfig.getKeyboard())) {
      configuration.setTextInputMethodQualifier(
          new TextInputMethodQualifier(KEYBOARD_MAP.get(protoConfig.getKeyboard())));
    }

    if (NAV_STATE_MAP.containsKey(protoConfig.getNavHidden())) {
      configuration.setNavigationStateQualifier(
          new NavigationStateQualifier(NAV_STATE_MAP.get(protoConfig.getNavHidden())));
    }

    if (NAVIGATION_MAP.containsKey(protoConfig.getNavigation())) {
      configuration.setNavigationMethodQualifier(
          new NavigationMethodQualifier(NAVIGATION_MAP.get(protoConfig.getNavigation())));
    }

    if (protoConfig.getSdkVersion() > 0) {
      configuration.setVersionQualifier(new VersionQualifier(protoConfig.getSdkVersion()));
    }

    return Arrays.stream(configuration.getQualifiers())
        .map(ResourceQualifier::getFolderSegment)
        .collect(toList());
  }

  /**
   * Reads compiled resource data files and adds them to consumers
   *
   * @param compiledFileStream First byte is number of compiled files represented in this file. Next
   *     8 bytes is a long indicating the length of the metadata describing the compiled file. Next
   *     N bytes is the metadata describing the compiled file. The remaining bytes are the actual
   *     original file.
   * @param consumers
   * @param fqnFactory
   * @throws IOException
   */
  private void readCompiledFile(
      LittleEndianDataInputStream compiledFileStream,
      KeyValueConsumers consumers,
      Factory fqnFactory)
      throws IOException {
    // Skip aligned size. We don't need it here.
    Preconditions.checkArgument(compiledFileStream.skipBytes(8) == 8);

    int resFileHeaderSize = compiledFileStream.readInt();

    // Skip data payload size. We don't need it here.
    Preconditions.checkArgument(compiledFileStream.skipBytes(8) == 8);

    byte[] file = new byte[resFileHeaderSize];
    compiledFileStream.read(file, 0, resFileHeaderSize);
    CompiledFile compiledFile = CompiledFile.parseFrom(file);

    Path sourcePath = Paths.get(compiledFile.getSourcePath());
    FullyQualifiedName fqn = fqnFactory.parse(sourcePath);
    DataSource dataSource = DataSource.of(sourcePath);

    if (consumers != null) {
      consumers.overwritingConsumer.accept(fqn, DataValueFile.of(dataSource));
    }

    for (CompiledFile.Symbol exportedSymbol : compiledFile.getExportedSymbolList()) {
      if (!exportedSymbol.getResourceName().startsWith("android:")) {
        // Skip writing resource xml's for resources in the sdk
        FullyQualifiedName symbolFqn =
            fqnFactory.create(
                ResourceType.ID, exportedSymbol.getResourceName().replaceFirst("id/", ""));

        DataResourceXml dataResourceXml =
            DataResourceXml.from(null, dataSource, ResourceType.ID, null);
        consumers.combiningConsumer.accept(symbolFqn, dataResourceXml);
      }
    }
  }

  private void readAttributesFile(
      InputStream resourceFileStream,
      FileSystem fileSystem,
      BiConsumer<DataKey, DataResource> combine,
      BiConsumer<DataKey, DataResource> overwrite)
      throws IOException {

    Header header = Header.parseDelimitedFrom(resourceFileStream);
    List<FullyQualifiedName> fullyQualifiedNames = new ArrayList<>();
    for (int i = 0; i < header.getEntryCount(); i++) {
      SerializeFormat.DataKey protoKey =
          SerializeFormat.DataKey.parseDelimitedFrom(resourceFileStream);
      fullyQualifiedNames.add(FullyQualifiedName.fromProto(protoKey));
    }

    DataSourceTable sourceTable = DataSourceTable.read(resourceFileStream, fileSystem, header);

    for (FullyQualifiedName fullyQualifiedName : fullyQualifiedNames) {
      SerializeFormat.DataValue protoValue =
          SerializeFormat.DataValue.parseDelimitedFrom(resourceFileStream);
      DataSource source = sourceTable.sourceFromId(protoValue.getSourceId());
      DataResourceXml dataResourceXml = (DataResourceXml) DataResourceXml.from(protoValue, source);
      AttributeType attributeType = AttributeType.valueOf(protoValue.getXmlValue().getValueType());

      if (attributeType.isCombining()) {
        combine.accept(fullyQualifiedName, dataResourceXml);
      } else {
        overwrite.accept(fullyQualifiedName, dataResourceXml);
      }
    }
  }

  public Map<DataKey, DataResource> readAttributes(CompiledResources resources) {
    try (ZipFile zipFile = new ZipFile(resources.getZip().toFile())) {
      return zipFile
          .stream()
          .filter(e -> e.getName().endsWith(".attributes"))
          .flatMap(
              entry -> {
                try {
                  final Stream.Builder<Entry<DataKey, DataResource>> builder = Stream.builder();
                  final BiConsumer<DataKey, DataResource> consumeToStream =
                      (k, v) -> builder.add(new SimpleImmutableEntry<>(k, v));
                  readAttributesFile(
                      zipFile.getInputStream(entry),
                      FileSystems.getDefault(),
                      consumeToStream,
                      consumeToStream);
                  return builder.build();
                } catch (IOException e) {
                  throw new DeserializationException(e);
                }
              })
          .collect(toImmutableSetMultimap(Entry::getKey, Entry::getValue))
          .asMap()
          .entrySet()
          .stream()
          .collect(
              toMap(
                  Entry::getKey,
                  e ->
                      e.getValue()
                          .stream()
                          .reduce(
                              ((FullyQualifiedName) e.getKey()).isOverwritable()
                                  ? DataResource::overwrite
                                  : DataResource::combineWith)
                          .orElseThrow(IllegalStateException::new)));
    } catch (IOException e) {
      throw new DeserializationException(e);
    }
  }

  public void readTable(InputStream in, KeyValueConsumers consumers) throws IOException {
    final ResourceTable resourceTable = ResourceTable.parseFrom(in);
    readPackages(consumers, resourceTable);
  }

  @Override
  public void read(Path inPath, KeyValueConsumers consumers) {
    Stopwatch timer = Stopwatch.createStarted();
    try (ZipFile zipFile = new ZipFile(inPath.toFile())) {
      Enumeration<? extends ZipEntry> resourceFiles = zipFile.entries();

      while (resourceFiles.hasMoreElements()) {
        ZipEntry resourceFile = resourceFiles.nextElement();
        String fileZipPath = resourceFile.getName();
        int resourceSubdirectoryIndex = fileZipPath.indexOf('_', fileZipPath.lastIndexOf('/'));
        Path filePath =
            Paths.get(
                String.format(
                    "%s%c%s",
                    fileZipPath.substring(0, resourceSubdirectoryIndex),
                    '/',
                    fileZipPath.substring(resourceSubdirectoryIndex + 1)));

        String shortPath = filePath.getParent().getFileName() + "/" + filePath.getFileName();

        if (filteredResources.contains(shortPath) && !Files.exists(filePath)) {
          // Skip files that were filtered out during analysis.
          // TODO(asteinb): Properly filter out these files from android_library symbol files during
          // analysis instead, and remove this list.
          continue;
        }

        try (InputStream resourceFileStream = zipFile.getInputStream(resourceFile)) {
          final String[] dirNameAndQualifiers =
              filePath.getParent().getFileName().toString().split(SdkConstants.RES_QUALIFIER_SEP);
          Factory fqnFactory = Factory.fromDirectoryName(dirNameAndQualifiers);

          if (fileZipPath.endsWith(".attributes")) {
            readAttributesFile(
                resourceFileStream,
                inPath.getFileSystem(),
                consumers.combiningConsumer,
                consumers.overwritingConsumer);
          } else {
            LittleEndianDataInputStream dataInputStream =
                new LittleEndianDataInputStream(resourceFileStream);

            int magicNumber = dataInputStream.readInt();
            int formatVersion = dataInputStream.readInt();
            int numberOfEntries = dataInputStream.readInt();
            int resourceType = dataInputStream.readInt();

            if (resourceType == 0) { // 0 is a resource table
              readResourceTable(dataInputStream, consumers);
            } else if (resourceType == 1) { // 1 is a resource file
              readCompiledFile(dataInputStream, consumers, fqnFactory);
            } else {
              throw new DeserializationException(
                  "aapt2 version mismatch.",
                  new DeserializationException(
                      String.format(
                          "Unexpected tag for resourceType %s expected 0 or 1 in %s."
                              + "\n Last known good values:"
                              + "\n\tmagicNumber 1414545729 (is %s)"
                              + "\n\tformatVersion 1 (is %s)"
                              + "\n\tnumberOfEntries 1 (is %s)",
                          resourceType, fileZipPath, magicNumber, formatVersion, numberOfEntries)));
            }
          }
        }
      }
    } catch (IOException e) {
      throw new DeserializationException("Error deserializing " + inPath, e);
    } finally {
      logger.fine(
          String.format(
              "Deserialized in compiled merged in %sms", timer.elapsed(TimeUnit.MILLISECONDS)));
    }
  }

  private static List<String> decodeSourcePool(byte[] bytes) throws UnsupportedEncodingException {
    ByteBuffer byteBuffer = ByteBuffer.wrap(bytes).order(ByteOrder.LITTLE_ENDIAN);

    int stringCount = byteBuffer.getInt(8);
    boolean isUtf8 = (byteBuffer.getInt(16) & (1 << 8)) != 0;
    int stringsStart = byteBuffer.getInt(20);
    // Position the ByteBuffer after the metadata
    byteBuffer.position(28);

    List<String> strings = new ArrayList<>();

    for (int i = 0; i < stringCount; i++) {
      int stringOffset = stringsStart + byteBuffer.getInt();

      if (isUtf8) {
        int characterCount = byteBuffer.get(stringOffset) & 0xFF;
        if ((characterCount & 0x80) != 0) {
          characterCount =
              ((characterCount & 0x7F) << 8) | (byteBuffer.get(stringOffset + 1) & 0xFF);
        }

        stringOffset += (characterCount >= 0x80 ? 2 : 1);

        int length = byteBuffer.get(stringOffset) & 0xFF;
        if ((length & 0x80) != 0) {
          length = ((length & 0x7F) << 8) | (byteBuffer.get(stringOffset + 1) & 0xFF);
        }

        stringOffset += (length >= 0x80 ? 2 : 1);

        strings.add(new String(bytes, stringOffset, length, "UTF8"));
      } else {
        int characterCount = byteBuffer.get(stringOffset) & 0xFFFF;
        if ((characterCount & 0x8000) != 0) {
          characterCount =
              ((characterCount & 0x7FFF) << 16) | (byteBuffer.get(stringOffset + 2) & 0xFFFF);
        }

        stringOffset += 2 * (characterCount >= 0x8000 ? 2 : 1);

        int length = byteBuffer.get(stringOffset) & 0xFFFF;
        if ((length & 0x8000) != 0) {
          length = ((length & 0x7FFF) << 16) | (byteBuffer.get(stringOffset + 2) & 0xFFFF);
        }

        stringOffset += 2 * (length >= 0x8000 ? 2 : 1);

        strings.add(new String(bytes, stringOffset, length, "UTF16"));
      }
    }

    return strings;
  }
}